Andricus sessilum
Andricus sessilum is a of gall wasp in the Cynipidae, a group known for inducing distinctive plant growths called galls on oak trees (Quercus spp.). Like other members of the Andricus, this species exhibits high specificity, with females laying in oak tissues to initiate gall formation. The developing larva secretes chemical signals that manipulate plant growth, creating a specialized structure that provides both food and shelter. Cynipid gall wasps are among the most diverse gall-forming insects, with each species typically producing a characteristic gall on specific host plants or plant parts.
Pronunciation
How to pronounce Andricus sessilum: /ˈændrɪkəs ˈsɛsɪləm/
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Host Associations
- Quercus - gall inductionSpecific oak not confirmed in provided sources; typical for Andricus species to be restricted to particular Quercus species or sections
Behavior
Females use their ovipositor to inject into oak plant tissues, initiating gall formation. The larva develops within the gall, secreting substances that redirect plant growth to form the protective structure. emerge by chewing through the gall wall.
Ecological Role
As a gall inducer, modifies oak tissue structure to create microhabitats that may subsequently be utilized by other organisms (, , hyperparasitoids), contributing to local biodiversity.
Similar Taxa
- Other Andricus speciesAll Andricus induce galls on oaks; differentiation requires examination of gall , location on plant (leaf, twig, bud), and specific oak species
- Other Cynipidae genera (e.g., Disholcaspis, Acraspis)Different of cynipid often target different plant parts or produce distinct gall forms; A. sessilum would be distinguished by its specific gall characteristics and association